AD8436-EVALZ Analog Devices, AD8436-EVALZ Datasheet

AD8436-EVALZ

Manufacturer Part Number

AD8436-EVALZ

Description

Power Management IC Development Tools Eval Board

Manufacturer

Analog Devices

Type

Other Power Managementr

Series

AD8436r

Datasheet

1.AD8436-EVALZ.pdf (24 pages)

Specifications of AD8436-EVALZ

Rohs

yes

Product

Evaluation Boards

Tool Is For Evaluation Of

AD8436

Input Voltage

+ / - 18 V

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Factory Pack Quantity

Current page: 1 of 24
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Data Sheet

FEATURES

Delivers true rms or average rectified value of ac waveform

High-Z FET separately powered input buffer

Precision dc output buffer

Wide power supply voltage range

4 mm × 4 mm LFCSP and 8 mm × 6 mm QSOP packages

ESD protected

GENERAL DESCRIPTION

The

power, true rms-to-dc converter loaded with options. It

computes a precise dc equivalent of the rms value of ac wave-

forms, including complex patterns such as those generated by

switch mode power supplies and triacs. Its accuracy spans a

wide range of input levels (see Figure 2) and temperatures.

The ensured accuracy of ≤±0.5% and ≤10 µV output offset

result from the latest Analog Devices, Inc., technology. The

crest factor error is <0.5% for CF values between 1 and 10.

The

misleading peak, averaging, or digital solutions. There is no

programming expense or processor overhead to consider, and

the 4 mm × 4 mm package easily fits into tight applications.

On-board buffer amplifiers enable the widest range of options

for any rms-to-dc converter available, regardless of cost. For

minimal applications, only a single external averaging capacitor

is required. The built-in high impedance FET buffer provides

an interface for external attenuators, frequency compensation,

or driving low impedance loads. A matched pair of internal

resistors enables an easily configurable gain-of-two or more,

extending the usable input range even lower. The low power,

precision input buffer makes the

portable multi-meters and other battery-powered applications.

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Fast settling at all input levels

Accuracy: ±10 μV ± 0.25% of reading (B grade)

Wide dynamic input range

Wide bandwidth:

Zero converter dc output offset

No residual switching products

Specified at 300 mV rms input

Accurate conversion with crest factors up to 10

Low power: 300 µA typical at ±2.4 V

Dual: ±2.4 V to ±18 V; single: 4.8 V to 36 V

AD8436

100 μV rms to 3 V rms (8.5 V p-p) full-scale input range

Larger inputs with external scaling

1 MHz for −3 dB (300 mV)

65 kHz for additional 1% error

≥ 10

is a new generation, translinear precision, low

delivers true rms results at less cost than

Ω, C

≤ 2 pF

AD8436

attractive for use in

Document Feedback

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Technical Support

The precision dc output buffer minimizes errors when driving

low impedance loads with extremely low offset voltages, thanks

to internal bias current cancellation. Unlike digital solutions, the

AD8436

low amplitudes (see Figure 2). A usable response of <100 µV and

>3 V extends the dynamic range with no external scaling,

accommodating demanding low level signal conditions and

The AD8436 operates from single or dual supplies of ±2.4 V

(4.8 V) to ±18 V (36 V). A and J grades are available in a

compact 4 mm × 4 mm, 20-lead chip-scale package; A and B

grades are available in a 20-lead QSOP package. The operating

temperature ranges are −40°C to 125°C for A and B grades and

0°C to 70°C for J grade.

allowing ample overrange without clipping.

OBUFIN+

OBUFIN–

IBUFGN

IBUFIN–

IBUFIN+

True RMS-to-DC Converter

SUM

RMS

has no switching circuitry limiting performance at high or

100µV

Figure 2. Usable Dynamic Range of the

FUNCTIONAL BLOCK DIAGRAM

AD8436

8kΩ

10kΩ

GREATER INPUT DYNAMIC RANGE

16kΩ

Low Cost, Low Power,

1mV

CAVG

RMS CORE

–

10kΩ

10pF

10mV

Figure 1.

AD8436

ΔΣ SOLUTION

CCF

FET OP AMP

DC BUFFER

100mV

VCC

100kΩ

VEE

16kΩ

AD8436

vs. ∆Σ

www.analog.com

IGND

OGND

OUT

IBUFOUT

OBUFOUT

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